EP 1058365 A2 20001206 - Electronic trip unit with user-adjustable sensitivity to current spikes
Title (en)
Electronic trip unit with user-adjustable sensitivity to current spikes
Title (de)
Elektronische Auslöseeinheit mit vom Anwender einstellbarer Empfindlichkeit
Title (fr)
Unité de déclenchement électronique à sensibilité ajustable par l'utilisateur
Publication
Application
Priority
US 32560599 A 19990603
Abstract (en)
A circuit breaker trip unit with user-adjustable sensitivity to current spikes (22) includes a user-adjustable switch (30), a current sensor (32), an analog-to-digital (A/D) converter (34), a microprocessor (36), and a power supply (37). The current sensor (32) is electrically connected to the distribution circuit (10) and provides analog signals indicative of current measurements in the distribution circuit (10) to the A/D converter (34). The A/D converter (34) converts the analog signal to a digital line signal and presents the digital line signal, via a bus (38), to the microprocessor (36). The user-adjustable switch (30) is arranged to provide a signal indicative of a limit value, via a bus (40), to the microprocessor (36). The microprocessor (36) comprises a plurality of registers (42-48) and ROM (50) internal thereto. The ROM (50) includes trip unit application code, e.g., main functionality firmware, including initializing parameters, boot code, and a short circuit protection algorithm. The short circuit protection algorithm compares the line signal stored in the threshold register (48) to a predetermined threshold value stored in the ROM (50). If the line signal exceeds the threshold value, the microprocessor increments a peak count value stored in the peak count register (42). When the peak count reaches the limit value stored in the peak count register (42), a trip signal is generated by the microprocessor (36). <IMAGE>
IPC 1-7
IPC 8 full level
H01H 83/02 (2006.01); H02H 1/04 (2006.01); H02H 3/02 (2006.01); H02H 3/093 (2006.01); H02H 3/44 (2006.01); H02H 3/08 (2006.01)
CPC (source: EP US)
H02H 1/04 (2013.01 - EP US); H02H 3/44 (2013.01 - EP US); H02H 3/08 (2013.01 - EP US)
Citation (applicant)
- EP 0046024 A1 19820217 - SOUTH EASTERN ELEC BOARD [GB]
- US 4423459 A 19831227 - STICH FREDERICK A [US], et al
Designated contracting state (EPC)
BE DE ES FR GB IT
DOCDB simple family (publication)
EP 1058365 A2 20001206; EP 1058365 A3 20030423; EP 1058365 B1 20091021; CN 100511906 C 20090708; CN 100539343 C 20090909; CN 1276640 A 20001213; CN 1855656 A 20061101; DE 60043176 D1 20091203; HU 0002040 D0 20000828; HU P0002040 A2 20010228; HU P0002040 A3 20030728; JP 2001016761 A 20010119; MX PA00005504 A 20020308; TW 512566 B 20021201; US 2001033470 A1 20011025; US 6262872 B1 20010717; US 6400543 B2 20020604
DOCDB simple family (application)
EP 00304600 A 20000531; CN 00117986 A 20000602; CN 200610058957 A 20000602; DE 60043176 T 20000531; HU P0002040 A 20000530; JP 2000163933 A 20000601; MX PA00005504 A 20000602; TW 89110415 A 20000529; US 32560599 A 19990603; US 68201101 A 20010709